Kurt Sutter writing an article justifying his decisions for the show and this season's finale doesn't automatically make it a good finale. It's obvious that a vast majority of fans were disappointed, otherwise he wouldn't have to write that article in the first place.
All season they built up several stories which I have already listed a couple times in this thread since the finale aired and they wiped them all out by having the cartel work for the CIA. Juice getting revealed for having a black father? not anymore, case was shut down and the evidence was given to Juice to destroy. Bobby Elvis locked up because Otto ratted? not anymore, CIA is going to try and get the charges dismissed. Tara being kidnapped and killed? nope, they were going to put her in protective custody, now she'll take over Gemma's role and be even more annoying. SOA and the IRA being taken down with RICO? nope, CIA usurped the district attorney and shut it all down. It wouldn't be such a big deal if the entire season wasn't spent building each of those things up to a boiling point and then wiping them all out in one fell swoop by revealing that the CIA was involved.
I'm a huge fan of the show, I have watched it since day one, but that finale was a big let down for me. The only thing that would've partially saved it for me would've been Tara getting killed off or leaving Jax. When she walked into the conference room at the end and said "I'm not going anywhere" I was like